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158 



THE 0PIIIURIDJ5. 



Color In alcohol : faintly bluish^ moutli shields (except the madreporite) 

 and radial shields with red spots ; the arms, especially ventral and side 

 plates, also reddish. 



One specimen from Station 3418^ 660 f. 



37. Amphiura notacantha n. sp 



Plate XIII. Figs. 7-9. 



This species so closely resembles the foregoing that a detailed descrip- 

 tion is quite unnecessary, as will be seen from a comparison of the figures. 

 It will be sufficient to note the differences. 



The disk is quite naked on the under side, only the genital scales are 



-I 



distinct. The dorsal side towards the margin with some few spines. The 

 radial shields are longer, as long as half the radius of the disk, in contact 

 in their outer part, their inner ends separated by several small irregular 

 scales; they are a little curved; no red spots are seen. 



One specimen (9 mm. diameter of disk) from Station 3424, 676 f. 



From Stations 3393, 1020 f., and 3435, 859 £, there is one specimen 

 from each, which appear to belong to one of these two species; but as they 

 have lost the disk, it cannot be said with certainty to which of them they 

 belong. Most likely it is the latter, because the species with naked under. 

 side are more liable to cast off the disk than those with scaled under side. 

 Inconsiderable variations are seen in the form of the mouth papillae and 

 mouth shields. 



38. Amphiura sp. 



Plate XIII. Figs. 1-3. 



From Station 3418, 660 f., there is a specimen of an AmjMiii^a which 

 appears to be a new species. It belongs to the group of Amphmra species 

 with 5 mouth papilte on each side (-4. cuneata Lym., A. tumida Lym., A. 

 nereis Lym., and the species figured by Ltmak (76), Plate V. Figs. 64-66). 

 It seems to be nearest related to A. nereis, but, as the disk is wholly 

 wanting, it cannot be determined with certainty, nor can the description 

 be complete. 



The arms are thin and slender, about 80 mm., ten times or more the diam- 

 eter of the disk. Four or five small, rounded, almost equal, close set moutli 

 papillae, besides those on the apex, which are the largest. Mouth shield 



f 



s 



i 



